[FFmpeg-user] Trouble with LPCM audio from D-VHS deck

Mike Brown brown at mrvideo.vidiot.com
Wed Feb 15 03:06:21 CET 2012


On to the next issue.

I have a D-VHS deck that will firewire the analog video to MPEG-2 video
conversion to my computer, via TSReader.  Within the mux is a MPEG audio
stream and a LPCM audio stream.

The authors of the VideReDo program attempted to convert the LPCM audio to
a WAV file, but it was extremely distorted.

Now that I have an up-to-date ffmpeg, I ran the stream through it and got:

#####
ffmpeg version N-37771-gfd0b8d5 Copyright (c) 2000-2012 the FFmpeg developers
  built on Feb 11 2012 13:38:28 with gcc 4.6.2
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      51. 39.100 / 51. 39.100
  libavcodec     54.  1.100 / 54.  1.100
  libavformat    54.  0.100 / 54.  0.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 62.100 /  2. 62.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  6.100 /  0.  6.100
  libpostproc    52.  0.100 / 52.  0.100
[mpeg2video @ 0224B6E0] mpeg_decode_postinit() failure
    Last message repeated 7 times
[mpegts @ 0214A9E0] decoding for stream 2 failed
[mpegts @ 0214A9E0] Could not find codec parameters (Audio: aac_latm (BSSD / 0x44535342), 0 channels, s16)
[mpegts @ 0214A9E0] PES packet size mismatch
    Last message repeated 1 times
Input #0, mpegts, from 'MPEG-LPCM-sample.ts':
  Duration: 00:00:05.23, start: 4209.912289, bitrate: 17636 kb/s
  Program 1 
    Stream #0:0[0x1000]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p, 720x480 [SAR 8:9 DAR 4:3], 15000 kb/s, 32.92 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x1002]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16, 384 kb/s
    Stream #0:2[0x1004]: Audio: aac_latm (BSSD / 0x44535342), 0 channels, s16
At least one output file must be specified
#####

I find it hard to believe that the D-VHS deck created a LPCM file and put
nothing in it.  It also doesn't make any sense that it thinks that it is an
AAC formated audio file.

A five second sample of the file is available at:

    http://vidiot.com/MPEG-LPCM-sample.ts
	11534336 bytes

I'd appreciate someone else looking at this file.

Thanks.

MB
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